title: Efficient near-infrared quantum cutting in NaYF4: Ho3+, Yb3+ for solar photovoltaics.
abstract: Quantum cutting converting a ultraviolet photon into two near-infrared photons has been demonstrated by spectroscopic measurements in NaYF4:Ho3+,Yb3+ synthesized by hydrothermal method. Evidence is provided to confirm the occurrence of quantum cutting. Upon excitation of Ho3+ 5G4 level, near-infrared quantum cutting could occur through a two-step resonance energy transfer from Ho3+ to Yb3+ by cross relaxation, with a maximum quantum efficiency of 155.2%. This result reveals the possibility of violet to near-infrared quantum cutting with a quantum efficiency larger than 100% in Ho3+/Yb3+ codoped fluorides, suggesting the possible application in modifying the solar spectrum to enhance the efficiency of silicon solar cells.
authors.affiliation: Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Kaimo
authors.initials: K
authors.lastname: Deng
authors.forename: Tao
authors.initials: T
authors.lastname: Gong
authors.forename: Lingxun
authors.initials: L
authors.lastname: Hu
authors.forename: Xiantao
authors.initials: X
authors.lastname: Wei
authors.forename: Yonghu
authors.initials: Y
authors.lastname: Chen
authors.forename: Min
authors.initials: M
authors.lastname: Yin
mesh_terms: D011211:Electric Power Supplies; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005459:Fluorides / Q000737:chemistry* / Q000528:radiation effects; D007259:Infrared Rays; D010777:Photochemistry / Q000295:instrumentation*; D012993:Solar Energy; D015019:Yttrium / Q000737:chemistry* / Q000528:radiation effects
chemical_list: C525362:sodium yttriumtetrafluoride; D015019:Yttrium; D005459:Fluorides